Bellwork
Draw a unit circle picture to
find cos(150o).
Mar 14­8:42 AM
Mar 14­8:43 AM
Converting Radians to
Degrees:
Discuss what you
remember about
dimensional analysis.
180o = π rad
circle = 360o = 2π rad
Mar 14­9:31 AM
Converting Radians to Degrees:
How many radians is 270o?
Mar 14­8:50 AM
Mar 14­8:50 AM
Converting Radians to Degrees:
How many radians is 120o?
Mar 14­8:50 AM
1
Converting Radians to Degrees:
Converting Radians to Degrees:
How many degrees is 3π/5 rad?
Homework:
2) How many radians is 165o?
3) How many degrees is 5π/8 rad?
Mar 14­8:50 AM
Arc length:
Compute arc length with Arc aRTHur
s = rθ
Mar 14­8:50 AM
This pizza is 10" in
diameter, what is
the length of the
crust for one slice?
Mar 14­8:56 AM
Mar 14­8:50 AM
This pizza is 12" in
diameter, 2 slices
from a 90o angle,
what is the length
of the crust for
one slice?
Mar 14­8:56 AM
Homework problem #4
Got it page 847
Mar 14­9:00 AM
2
Creating Pi Plates:
Get a plate and a unit circle.
Copy the unit circle onto your plate,
filling in any blanks by solving the
problems.
Color it as you desire.
Mar 14­9:01 AM
Mar 14­8:04 AM
Exit ticket:
What is the sin(4π/3)?
Mar 14­9:35 AM
3